From: Kevin Hilman <khilman@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: Re: [patch] Real-Time Preemption, -RT-2.6.10-rc3-mm1-V0.7.34-01
Date: Tue, 11 Jan 2005 16:34:49 +0100 [thread overview]
Message-ID: <aa667b8b0501110734266a44ab@mail.gmail.com> (raw)
Using V0.7.34-01, I'm seeing the 'lock held at task exit time' bug.
It's coming from a kernel module which in its init function creates a
thread. The thread does a daemonize() and then goes to sleep waiting
on a semaphore which will be up'ed elsewhere. In other words:
init_module()
- sema_init(&sem, 0)
- kernel_thread(thread_func, 0, 0);
thread_func()
- daemonize()
- down(&sem)
The BUG() (see below for log) seems to be triggered when insmod exits.
BUG: insmod/2115, lock held at task exit time!
[c883225c] {&tinfo[i].sem}
.. held by: insmod: 2115 [c7b6f340, 0]
... acquired at: threads_init+0x8e/0x170 [rt_kthreads]
hm, PI interest held at exit time? Task:
insmod: 2115 [c7b6f340, 0]-------------------------
| waiter struct c4c1bf74:
| w->task:
insmod: 2123 [c7e68680, 0]
| lock:
[c883225c] {&tinfo[i].sem}
.. held by: insmod: 2115 [c7b6f340, 0]
... acquired at: threads_init+0x8e/0x170 [rt_kthreads]
| blocked at: thread_func+0x3d/0xb0 [rt_kthreads]
-------------------------
--
Kevin Hilman
http://hilman.org/kevin/
reply other threads:[~2005-01-11 15:35 UTC|newest]
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